(Closed) Doorway decoration

My reception hall is basically a plain room with cinderblock walls, similar to a gym. We’ve got decoration for the inside pretty well figured out, but we still need to figure out what to do to spruce up the doorways into the the room. I drew a diagram in Paint because I couldn’t think of a good way to describe it. Since the walls are cinderblock, there are limited ways to attach things, but as long as we don’t leave a permanent mark, we’re ok. The one idea I’ve gotten so far is to do a balloon archway, but I’m worried that it will feel like the 90s or prom.